A smart antenna is provided, which may include a plurality of antenna units and a controller. The controller may be coupled to the antenna units. The controller may scan an angle range by a first angle interval according to a characteristic vector of the antenna units and an initial angle; if the power change between any two adjacent scanning points is negative, the controller may multiply the first angle interval by a number to generate a second angle interval, and keep scanning the angle range by the second angle interval; when the controller completely scans the angle range or the power change between any two adjacent scanning points is positive, the controller may generate a power spectrum.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A smart antenna, comprising: a plurality of antenna units; and a controller, coupled to the antenna units; wherein the controller scans an angle range by a first angle interval according to a characteristic vector of the antenna units and an initial angle; if a power change between any two adjacent scanning points is negative, the controller multiplies the first angle interval by a number to generate a second angle interval, and keeps scanning the angle range by the second angle interval; when the controller completely scans the angle range or the power change between any two adjacent scanning points is positive, the controller generates a power spectrum.
2. The smart antenna of claim 1 , wherein each of the antenna units receives an input value from an electronic device.
3. The smart antenna of claim 2 , wherein the controller generates the characteristic value according to the input values of the antenna units.
4. The smart antenna of claim 1 , wherein the controller selects two scanning points with highest powers among the power spectrum, and calculates an average value of angels corresponding to the selected scanning points to generate an estimated angle.
5. The smart antenna of claim 4 , further comprising a plurality of weighting calculators corresponding to the antenna units, wherein the controller is coupled to the antenna units via the weighting calculators respectively.
6. The smart antenna of claim 5 , wherein the controller changes weightings of the antenna units via the weighting calculators according to the estimated angle in order to adjust a beam pattern of the antenna units.
7. The smart antenna of claim 6 , wherein the first angle interval comprises a plurality of angle units; when a number of the antenna units is lower than or equal to 2, the second angle interval is lower than or equal to 50°.
8. The smart antenna of claim 7 , wherein when the number of the antenna units is higher than or equal to 3, the second angle interval is lower than or equal to 20°.
9. A control method for smart antenna, in particular to a beam tracking method for antenna, comprising the following steps: scanning an angle range by a first angle interval according to a characteristic vector of antenna units and an initial angle; multiplying the first angle interval by a number to generate a second angle interval, and keeping scanning the angle range by the second angle interval if a power change between any two adjacent scanning points is negative; and generating a power spectrum when the angle range is completely scanned or the power change between any two adjacent scanning points is positive.
10. The control method for smart antenna of claim 9 , further comprising the following step: generating the characteristic vector according to input values of the antenna units.
11. The control method for smart antenna of claim 10 , further comprising the following step: selecting two scanning points with highest powers among the power spectrum, and calculating an average value of angels corresponding to the selected scanning points to generate an estimated angle.
12. The control method for smart antenna of claim 11 , further comprising the following step: changing weightings of the antenna units via the weighting calculators according to the estimated angle in order to adjust a beam pattern of the antenna units.
13. A smart antenna for a passive Wi-Fi device, the passive Wi-Fi device comprising a backscatter modulator, wherein the backscatter modulator is coupled to the smart antenna, and inputs data into the smart antenna; the smart antenna comprises: a plurality of antenna units; and a controller, coupled to the antenna units; wherein the controller scans an angle range by a first angle interval according to a characteristic vector of the antenna units and an initial angle; if a power change between any two adjacent scanning points is negative, the controller multiplies the first angle interval by a number to generate a second angle interval, and keeps scanning the angle range by the second angle interval; when the controller completely scans the angle range or the power change between any two adjacent scanning points is positive, the controller generates a power spectrum.
14. The smart antenna of claim 13 , wherein each of the antenna units receives an input value from an electronic device.
15. The smart antenna of claim 14 , wherein the controller generates the characteristic value according to the input values of the antenna units.
16. The smart antenna of claim 13 , wherein the controller selects two scanning points with highest powers among the power spectrum, and calculates an average value of angels corresponding to the selected scanning points to generate an estimated angle.
17. The smart antenna of claim 16 , further comprising a plurality of weighting calculators corresponding to the antenna units, wherein the controller is coupled to the antenna units via the weighting calculators respectively.
18. The smart antenna of claim 17 , wherein the controller changes weightings of the antenna units via the weighting calculators according to the estimated angle in order to adjust a beam pattern of the antenna units.
19. The smart antenna of claim 18 , wherein the first angle interval comprises a plurality of angle units; when a number of the antenna units is lower than or equal to 2, the second angle interval is lower than or equal to 50°.
20. The smart antenna of claim 19 , wherein when the number of the antenna units is higher than or equal to 3, the second angle interval is lower than or equal to 20°.
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November 21, 2017
March 3, 2020
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